I apologize if I haven’t seen it in another comment, but there is a category missing (sort of, let me quickly explain).

I like reading books from my phone with a dark theme (inverted colors). It’s not exactly an e-reader, though it is electronic.

I don’t claim it’s the best way, it’s just very convenient because of (former Reddit)/(now Lemmy) addiction to using my phone to read about cool stuff.

It’s particularly handy before sleeping or when commuting

Edit: added last sentence